1/*
2 * Copyright (c) 2010, Frank Lahm <franklahm@googlemail.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 */
14
15#ifdef HAVE_CONFIG_H
16#include "config.h"
17#endif /* HAVE_CONFIG_H */
18
19#include <sys/types.h>
20#include <sys/wait.h>
21#include <sys/stat.h>
22#include <errno.h>
23#include <limits.h>
24#include <signal.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <unistd.h>
29#include <libgen.h>
30
31#include <atalk/ftw.h>
32#include <atalk/adouble.h>
33#include <atalk/vfs.h>
34#include <atalk/util.h>
35#include <atalk/unix.h>
36#include <atalk/volume.h>
37#include <atalk/volinfo.h>
38#include <atalk/bstrlib.h>
39#include <atalk/bstradd.h>
40#include <atalk/queue.h>
41
42#include "ad.h"
43
44#define STRIP_TRAILING_SLASH(p) {                                   \
45        while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/')  \
46            *--(p).p_end = 0;                                       \
47    }
48
49static int fflg, iflg, nflg, vflg;
50
51static afpvol_t svolume, dvolume;
52static cnid_t did, pdid;
53static volatile sig_atomic_t alarmed;
54static char           *netatalk_dirs[] = {
55    ".AppleDouble",
56    ".AppleDB",
57    ".AppleDesktop",
58    NULL
59};
60
61static int copy(const char *, const char *);
62static int do_move(const char *, const char *);
63static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
64                             const char *dest_path);
65/*
66  Check for netatalk special folders e.g. ".AppleDB" or ".AppleDesktop"
67  Returns pointer to name or NULL.
68*/
69static const char *check_netatalk_dirs(const char *name)
70{
71    int c;
72
73    for (c=0; netatalk_dirs[c]; c++) {
74        if ((strcmp(name, netatalk_dirs[c])) == 0)
75            return netatalk_dirs[c];
76    }
77    return NULL;
78}
79
80/*
81  SIGNAL handling:
82  catch SIGINT and SIGTERM which cause clean exit. Ignore anything else.
83*/
84
85static void sig_handler(int signo)
86{
87    alarmed = 1;
88    return;
89}
90
91static void set_signal(void)
92{
93    struct sigaction sv;
94
95    sv.sa_handler = sig_handler;
96    sv.sa_flags = SA_RESTART;
97    sigemptyset(&sv.sa_mask);
98    if (sigaction(SIGTERM, &sv, NULL) < 0)
99        ERROR("error in sigaction(SIGTERM): %s", strerror(errno));
100
101    if (sigaction(SIGINT, &sv, NULL) < 0)
102        ERROR("error in sigaction(SIGINT): %s", strerror(errno));
103
104    memset(&sv, 0, sizeof(struct sigaction));
105    sv.sa_handler = SIG_IGN;
106    sigemptyset(&sv.sa_mask);
107
108    if (sigaction(SIGABRT, &sv, NULL) < 0)
109        ERROR("error in sigaction(SIGABRT): %s", strerror(errno));
110
111    if (sigaction(SIGHUP, &sv, NULL) < 0)
112        ERROR("error in sigaction(SIGHUP): %s", strerror(errno));
113
114    if (sigaction(SIGQUIT, &sv, NULL) < 0)
115        ERROR("error in sigaction(SIGQUIT): %s", strerror(errno));
116}
117
118static void usage_mv(void)
119{
120    printf(
121        "Usage: ad mv [-f | -i | -n] [-v] source target\n"
122        "       ad mv [-f | -i | -n] [-v] source ... directory\n\n"
123        "Move files around within an AFP volume, updating the CNID\n"
124        "database as needed. If either:\n"
125        " - source or destination is not an AFP volume\n"
126        " - source volume != destinatio volume\n"
127        "the files are copied and removed from the source.\n\n"
128        "The following options are available:\n\n"
129        "   -f   Do not prompt for confirmation before overwriting the destination\n"
130        "        path.  (The -f option overrides any previous -i or -n options.)\n"
131        "   -i   Cause mv to write a prompt to standard error before moving a file\n"
132        "        that would overwrite an existing file.  If the response from the\n"
133        "        standard input begins with the character `y' or `Y', the move is\n"
134        "        attempted.  (The -i option overrides any previous -f or -n\n"
135        "        options.)\n"
136        "   -n   Do not overwrite an existing file.  (The -n option overrides any\n"
137        "        previous -f or -i options.)\n"
138        "   -v   Cause mv to be verbose, showing files after they are moved.\n"
139        );
140    exit(EXIT_FAILURE);
141}
142
143int ad_mv(int argc, char *argv[])
144{
145    size_t baselen, len;
146    int rval;
147    char *p, *endp;
148    struct stat sb;
149    int ch;
150    char path[MAXPATHLEN];
151
152
153    pdid = htonl(1);
154    did = htonl(2);
155
156    argc--;
157    argv++;
158
159    while ((ch = getopt(argc, argv, "finv")) != -1)
160        switch (ch) {
161        case 'i':
162            iflg = 1;
163            fflg = nflg = 0;
164            break;
165        case 'f':
166            fflg = 1;
167            iflg = nflg = 0;
168            break;
169        case 'n':
170            nflg = 1;
171            fflg = iflg = 0;
172            break;
173        case 'v':
174            vflg = 1;
175            break;
176        default:
177            usage_mv();
178        }
179
180    argc -= optind;
181    argv += optind;
182
183    if (argc < 2)
184        usage_mv();
185
186    set_signal();
187    cnid_init();
188    if (openvol(argv[argc - 1], &dvolume) != 0) {
189        SLOG("Error opening CNID database for source \"%s\": ", argv[argc - 1]);
190        return 1;
191    }
192
193    /*
194     * If the stat on the target fails or the target isn't a directory,
195     * try the move.  More than 2 arguments is an error in this case.
196     */
197    if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
198        if (argc > 2)
199            usage_mv();
200        if (openvol(argv[0], &svolume) != 0) {
201            SLOG("Error opening CNID database for destination \"%s\": ", argv[0]);
202            return 1;
203        }
204        rval = do_move(argv[0], argv[1]);
205        closevol(&svolume);
206        closevol(&dvolume);
207        return 1;
208    }
209
210    /* It's a directory, move each file into it. */
211    if (strlen(argv[argc - 1]) > sizeof(path) - 1)
212        ERROR("%s: destination pathname too long", *argv);
213
214    (void)strcpy(path, argv[argc - 1]);
215    baselen = strlen(path);
216    endp = &path[baselen];
217    if (!baselen || *(endp - 1) != '/') {
218        *endp++ = '/';
219        ++baselen;
220    }
221
222    for (rval = 0; --argc; ++argv) {
223        /*
224         * Find the last component of the source pathname.  It
225         * may have trailing slashes.
226         */
227        p = *argv + strlen(*argv);
228        while (p != *argv && p[-1] == '/')
229            --p;
230        while (p != *argv && p[-1] != '/')
231            --p;
232
233        if ((baselen + (len = strlen(p))) >= PATH_MAX) {
234            SLOG("%s: destination pathname too long", *argv);
235            rval = 1;
236        } else {
237            memmove(endp, p, (size_t)len + 1);
238            openvol(*argv, &svolume);
239
240            if (do_move(*argv, path))
241                rval = 1;
242            closevol(&svolume);
243        }
244    }
245
246exit:
247    closevol(&dvolume);
248    return rval;
249}
250
251static int do_move(const char *from, const char *to)
252{
253    struct stat sb;
254    int ask, ch, first;
255
256    /*
257     * Check access.  If interactive and file exists, ask user if it
258     * should be replaced.  Otherwise if file exists but isn't writable
259     * make sure the user wants to clobber it.
260     */
261    if (!fflg && !access(to, F_OK)) {
262
263        /* prompt only if source exist */
264        if (lstat(from, &sb) == -1) {
265            SLOG("%s: %s", from, strerror(errno));
266            return (1);
267        }
268
269        ask = 0;
270        if (nflg) {
271            if (vflg)
272                printf("%s not overwritten\n", to);
273            return (0);
274        } else if (iflg) {
275            (void)fprintf(stderr, "overwrite %s? (y/n [n]) ", to);
276            ask = 1;
277        } else if (access(to, W_OK) && !stat(to, &sb)) {
278            (void)fprintf(stderr, "override for %s? (y/n [n]) ", to);
279            ask = 1;
280        }
281        if (ask) {
282            first = ch = getchar();
283            while (ch != '\n' && ch != EOF)
284                ch = getchar();
285            if (first != 'y' && first != 'Y') {
286                (void)fprintf(stderr, "not overwritten\n");
287                return (0);
288            }
289        }
290    }
291
292    int mustcopy = 0;
293    /*
294     * Besides the usual EXDEV we copy instead of moving if
295     * 1) source AFP volume != dest AFP volume
296     * 2) either source or dest isn't even an AFP volume
297     */
298    if (!svolume.volinfo.v_path
299        || !dvolume.volinfo.v_path
300        || strcmp(svolume.volinfo.v_path, dvolume.volinfo.v_path) != 0)
301        mustcopy = 1;
302
303    cnid_t cnid = 0;
304    if (!mustcopy) {
305        if ((cnid = cnid_for_path(&svolume, from, &did)) == CNID_INVALID) {
306            SLOG("Couldn't resolve CNID for %s", from);
307            return -1;
308        }
309
310        if (stat(from, &sb) != 0) {
311            SLOG("Cant stat %s: %s", to, strerror(errno));
312            return -1;
313        }
314
315        if (rename(from, to) != 0) {
316            if (errno == EXDEV) {
317                mustcopy = 1;
318                char path[MAXPATHLEN];
319
320                /*
321                 * If the source is a symbolic link and is on another
322                 * filesystem, it can be recreated at the destination.
323                 */
324                if (lstat(from, &sb) == -1) {
325                    SLOG("%s: %s", from, strerror(errno));
326                    return (-1);
327                }
328                if (!S_ISLNK(sb.st_mode)) {
329                    /* Can't mv(1) a mount point. */
330                    if (realpath(from, path) == NULL) {
331                        SLOG("cannot resolve %s: %s: %s", from, path, strerror(errno));
332                        return (1);
333                    }
334                }
335            } else { /* != EXDEV */
336                SLOG("rename %s to %s: %s", from, to, strerror(errno));
337                return (1);
338            }
339        } /* rename != 0*/
340
341        switch (sb.st_mode & S_IFMT) {
342        case S_IFREG:
343            if (dvolume.volume.vfs->vfs_renamefile(&dvolume.volume, -1, from, to) != 0) {
344                SLOG("Error moving adouble file for %s", from);
345                return -1;
346            }
347            break;
348        case S_IFDIR:
349            break;
350        default:
351            SLOG("Not a file or dir: %s", from);
352            return -1;
353        }
354
355        /* get CNID of new parent dir */
356        cnid_t newpdid, newdid;
357        if ((newdid = cnid_for_paths_parent(&dvolume, to, &newpdid)) == CNID_INVALID) {
358            SLOG("Couldn't resolve CNID for parent of %s", to);
359            return -1;
360        }
361
362        if (stat(to, &sb) != 0) {
363            SLOG("Cant stat %s: %s", to, strerror(errno));
364            return 1;
365        }
366
367        char *p = strdup(to);
368        char *name = basename(p);
369        if (cnid_update(dvolume.volume.v_cdb, cnid, &sb, newdid, name, strlen(name)) != 0) {
370            SLOG("Cant update CNID for: %s", to);
371            return 1;
372        }
373        free(p);
374
375        struct adouble ad;
376        ad_init(&ad, dvolume.volinfo.v_adouble, dvolume.volinfo.v_ad_options);
377        if (ad_open_metadata(to, S_ISDIR(sb.st_mode) ? ADFLAGS_DIR : 0, O_RDWR, &ad) != 0) {
378            SLOG("Error opening adouble for: %s", to);
379            return 1;
380        }
381        ad_setid(&ad, sb.st_dev, sb.st_ino, cnid, newdid, dvolume.db_stamp);
382        ad_flush(&ad);
383        ad_close_metadata(&ad);
384
385        if (vflg)
386            printf("%s -> %s\n", from, to);
387        return (0);
388    }
389
390    if (mustcopy)
391        return copy(from, to);
392
393    /* If we get here it's an error */
394    return -1;
395}
396
397static int copy(const char *from, const char *to)
398{
399    struct stat sb;
400    int pid, status;
401
402    if (lstat(to, &sb) == 0) {
403        /* Destination path exists. */
404        if (S_ISDIR(sb.st_mode)) {
405            if (rmdir(to) != 0) {
406                SLOG("rmdir %s: %s", to, strerror(errno));
407                return (1);
408            }
409        } else {
410            if (unlink(to) != 0) {
411                SLOG("unlink %s: %s", to, strerror(errno));
412                return (1);
413            }
414        }
415    } else if (errno != ENOENT) {
416        SLOG("%s: %s", to, strerror(errno));
417        return (1);
418    }
419
420    /* Copy source to destination. */
421    if (!(pid = fork())) {
422        execl(_PATH_AD, "ad", "cp", vflg ? "-Rpv" : "-Rp", from, to, (char *)NULL);
423        _exit(1);
424    }
425    while ((waitpid(pid, &status, 0)) == -1) {
426        if (errno == EINTR)
427            continue;
428        SLOG("%s cp -R %s %s: waitpid: %s", _PATH_AD, from, to, strerror(errno));
429        return (1);
430    }
431    if (!WIFEXITED(status)) {
432        SLOG("%s cp -R %s %s: did not terminate normally", _PATH_AD, from, to);
433        return (1);
434    }
435    switch (WEXITSTATUS(status)) {
436    case 0:
437        break;
438    default:
439        SLOG("%s cp -R %s %s: terminated with %d (non-zero) status",
440             _PATH_AD, from, to, WEXITSTATUS(status));
441        return (1);
442    }
443
444    /* Delete the source. */
445    if (!(pid = fork())) {
446        execl(_PATH_AD, "ad", "rm", "-R", from, (char *)NULL);
447        _exit(1);
448    }
449    while ((waitpid(pid, &status, 0)) == -1) {
450        if (errno == EINTR)
451            continue;
452        SLOG("%s rm -R %s: waitpid: %s", _PATH_AD, from, strerror(errno));
453        return (1);
454    }
455    if (!WIFEXITED(status)) {
456        SLOG("%s rm -R %s: did not terminate normally", _PATH_AD, from);
457        return (1);
458    }
459    switch (WEXITSTATUS(status)) {
460    case 0:
461        break;
462    default:
463        SLOG("%s rm -R %s: terminated with %d (non-zero) status",
464              _PATH_AD, from, WEXITSTATUS(status));
465        return (1);
466    }
467    return 0;
468}
469
470static void
471preserve_fd_acls(int source_fd,
472                 int dest_fd,
473                 const char *source_path,
474                 const char *dest_path)
475{
476    ;
477}
478